I've estimate the power usage of the EP121 to be approximately the following: Base usage around 7W (screen off) + 3W to 4W for low to high brightness screen + 0 to .2W for idle bluetooth and WIFI + 2W to 3W for watching an AVI movie stored on SD or 4W to 5W for watching a Netflix movie via WIFI + 7W to 18W for CPU intensive tasks ranging from compiling in Visual Studio to running Prime95 For example: idle computer with BT and WIFI on is around 10W. watching AVI movie is around 12.5W watching Netflix is around 14.5W compiling in Visual Studio 19W running Prime95 29W I found that enabling Bluetooth really didn't affect power. Neither did disabling the webcam driver. Anyone else experience anything different? FYI: this was tested using Battery Bar Pro.